import 'package:flutter/material.dart';

class FourthPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return new FourthPageState();
  }
}

class FourthPageState extends State<FourthPage> {
  @override
  Widget build(BuildContext context) {
    return new Center(child: Text("关于手册"),);
  }
}